*{
    margin: 0;
    padding: 0;
}
.in{
    display: flex;
}
.box-left{
    width: 80%;
    padding: 0 10px;
    background-color: skyblue;
    box-sizing: border-box;
}
.box-right{
    width: 20%;
    background-color: pink;
    box-sizing: border-box;
}